1TB6:
reference: Structure of the antithrombin-thrombin-heparin ternary complex reveals the antithrombotic mechanism of heparin., Li W, Johnson DJ, Esmon CT, Huntington JA, Nat Struct Mol Biol 2004 Sep;11(9):857-62. Epub 2004 Aug 15. PMID: 15311269

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).